Only if they were swapped from a '73 up A-body. '67-72 10" brakes were small bolt pattern, small upper ball joint.
And this goes to my point, just because someone saw something in a wrecking yard some time doesn't mean it came from the factory that way. There are two versions of factory A-body 10" drums and spindles. Up to '72 the 10" drums used a 5x4" pattern (like all A-bodies up until then), and a small upper ball joint (also, all A-bodies up until '72). In '73, the large bolt pattern was implemented on all front disk brake A-bodies, and the UCA's used the large upper ball joint just like the B/E cars did before. 73+ 10" front drum A-bodies kept the 5x4" pattern, but got the large upper ball joint arms.
So, two A-body 10" drum spindles. '72 down has an A6 inner bearing and small ball joint taper. November '72 up (73 model year) used an A17 inner bearing and has a large ball joint taper. Just like the TSB describes.
